<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>图形</title>
    <style>
        .sjx1{
            width: 0px;
            height: 0px;
            border-top: 100px solid red;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
            border-bottom: 50px solid transparent;
        }
        .sjx2{
            width: 100px;
            height: 100px;
            background: linear-gradient(45deg,red 50%,transparent 50%);
        }
        .sjx3{
            font-size: 200px;

        }
        .sx1{
            width: 100px;
            height: 100px;
            background-color: red;
            border-radius: 100px 0 0;
        }
        .sx2{
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: linear-gradient(90deg,red 50%,transparent 50%);
        }
    </style>
</head>
<body>
    <div class="sjx1">三角形1</div>
    <div class="sjx2">三角形2</div>
    <div class="sjx3">&#9660;</div>

    <div class="sx1">扇形1</div>
    <div class="sx2">扇形2</div>
</body>
</html>